There was an issue introduced into Chrome beginning with Chrome 35 regarding KDE system tray icons. Basically, with Chrome 35 if you don't have libappindicator installed, you don't see them at all.
If you have libappindicator installed, you see the default blank sheet of paper icon.
This has been fixed now in Chrome 37 unstable.
If you don't have libappindicator it is fixed by:
which is "Add X11 status tray icon support".
If you have libappindicator installed, it is fixed by:
which is "Systray icon for notification center is not available"
There is a problem however in the implementation of 362880 that they didn't quite get the icons sized correctly. That issue is still open:
which is "System tray indicator icons are blurry in KDE"
My understanding is that KDE5/PlasmaNext will *drop* support for the legacy XEmbed-based system tray protocol, which means that if you are depending on 267195 to show system tray icons, it won't work. I also understand that F21 will be using KDE5/PlasmaNext.
That being the case, it would be a good idea for all the Chromium/Chrome users to go out and star 382487 so the Chromium team will fix this issue. Otherwise, be prepared for blurry icons for KDE.